Build 26100.8106: Windows Insider Release Preview Channel, March 2026. Narrator image descriptions and Smart App Control settings
Release Preview Insiders on Windows 11 24H2 and 25H2 get Narrator image descriptions with Copilot, except in the European Economic Area, plus a way to turn Smart App Control on or off without a clean install.
Does it affect you? Applies to: Devices enrolled in the Release Preview Channel running Windows 11 version 24H2 (build 26100.8106) or 25H2 (build 26200.8106).
This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.
What changes
Improvements 16 changes
Settings
For: everyone in the Release Preview Channel
File Explorer
For: everyone in the Release Preview Channel
- Files downloaded from the internet are more reliably unblocked so you can preview them in File Explorer.3
Display
- With a native USB4 monitor connection, the USB controller can use its lowest power level while the PC sleeps, saving battery life.4
- Auto rotation works more reliably after the PC wakes from sleep.5
- HDR works more reliably on displays with non-compliant DisplayID 2.0 blocks.6
- Monitors with DisplayID report a more accurate size through WMI monitor APIs.7
Printing
For: IT administrators managing printer connections
-
Printer connections support an updated baseline for older Windows versions.8
The downlevel baseline is Windows 10, version 1607, or Windows Server 2016 (build 14393).
Windows Hello
- Fingerprint sign-in works more reliably on certain devices.9
Safe mode
For: everyone in the Release Preview Channel
- Taskbar components load more reliably in Safe mode.10
Voice Access
For: people using Voice Access in English
- Voice Access detects and writes numbers more accurately in English.11
Start menu
For: IT administrators using Group Policy to set Start menu layouts
-
Start menu layouts apply more reliably through Group Policy when the JSON includes
desktopAppLink.12
Remote Desktop
For: IT administrators managing Remote Desktop
-
A Remote Desktop configuration command now recognizes an additional setting.13
Set-RDSessionCollectionConfigurationnow recognizesDisableSeamlessLanguageBar.
Audio
- Short MIDI messages are handled better when an application starts without providing long message buffers.14
Narrator
For: everyone in the Release Preview Channel
- Narrator’s Natural Voices experience and setup are more reliable.15
Performance & Reliability
For: people running x64 apps on ARM64 devices
- Windows Recovery Environment is more stable when x64 apps run on ARM64 devices; the apps run more smoothly and respond as expected.16
New features 10 changes
Narrator
For: Release Preview Insiders; on-device descriptions are for Copilot+ PCs
-
Narrator’s new image-description feature works with Copilot, but isn’t available in the European Economic Area.17
On Copilot+ PCs, Narrator can also provide instant, on-device descriptions.
Smart App Control
For: everyone in the Release Preview Channel
-
You can turn Smart App Control on or off without a clean install.18
When enabled, Smart App Control helps block untrusted or potentially harmful apps.
Settings
Account Settings
-
Microsoft 365 Family subscribers can upgrade to another Microsoft 365 plan from Settings > Accounts.21
Turn off Suggested content in Settings to remove the upgrade option.
-
Dialog boxes in Settings > Accounts > Other users have a modernized design and support dark mode.22
Whether the dialog box option is visible depends on whether the device has a domain-joined work or school account.
Input
For: Release Preview Insiders using a pen
-
A new pen setting lets the pen tail button open the same app as the Copilot key.23
The setting is called Same as Copilot key.
File Explorer
For: everyone in the Release Preview Channel
Display
For: people using supported monitors
- Monitors can report refresh rates higher than 1,000 Hz.26
Fix 1 change
System File Checker
For: everyone in the Release Preview Channel
-
Running
sfc /scannowno longer shows an unexpected extra error message.27
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2026-03-12
- Type
- Windows Insider build
| Version | Build | Channel |
|---|---|---|
| 24H2 | 26100.8106 | Release Preview Channel |
| 25H2 | 26200.8106 | Release Preview Channel |
Security
No vulnerabilities are listed for this update.
Sources
Cited passages from Microsoft's official notes (27)
-
1.
Improved the performance of loading Home in Settings.
blogs.windows.com -
2.
Improved reliability of downloading necessary updates when prompted in Settings > System > Advanced.
blogs.windows.com -
3.
Improved reliability of unblocking files downloaded from the internet in order to preview them in File Explorer.
blogs.windows.com -
4.
While using a native USB4 monitor connection, the USB controller can now go to the lowest power level while the PC is sleeping, saving battery life.
blogs.windows.com -
5.
Improved reliability of auto rotation after resuming from sleep.
blogs.windows.com -
6.
Improved HDR reliability for displays with non-compliant DisplayID 2.0 blocks.
blogs.windows.com -
7.
Monitors with DisplayID now report a more accurate size when using the WMI monitor APIs.
blogs.windows.com -
8.
Updated downlevel baseline support for printer connections to be Windows 10, version 1607 / Windows Server 2016 (Build 14393).
blogs.windows.com -
9.
Improved: Windows Hello Fingerprint reliability for certain devices.
blogs.windows.com -
10.
Improved reliability of loading components of the taskbar in safe mode.
blogs.windows.com -
11.
Improved how numbers are detected and written when using Voice Access in English.
blogs.windows.com -
12.
Improved reliability of applying Start menu layout via group policy when desktopAppLink is present in the JSON.
blogs.windows.com -
13.
The Set-RDSessionCollectionConfiguration PowerShell command now recognizes DisableSeamlessLanguageBar.
blogs.windows.com -
14.
Improved handling of short MIDI messages in cases where an application was initialized without providing long message buffers.
blogs.windows.com -
15.
This update improves the Natural Voices experience in Narrator. It also makes Natural Voices setup more reliable.
blogs.windows.com -
16.
This update improves stability in Windows Recovery Environment (Windows RE) when you run x64 apps on ARM64 devices.
blogs.windows.com -
17.
This feature isn’t available in the European Economic Area.
blogs.windows.com -
18.
You can turn Smart App Control (SAC) on or off without needing a clean install.
blogs.windows.com -
19.
The Settings About page (Settings > System > About) has been improved to provide a more structured and intuitive experience, offering clearer device specifications
blogs.windows.com -
20.
The device information card on the Settings Home page simplifies key device specifications and improves consistency across the end-to-end flow
blogs.windows.com -
21.
Microsoft 365 Family subscribers can upgrade to a different Microsoft 365 plan from Settings > Accounts.
blogs.windows.com -
22.
This update improves the design of the dialog boxes in Settings > Accounts > Other users to match the modern Windows look and support dark mode.
blogs.windows.com -
23.
You can now choose the new Same as Copilot key option, which enables the pen tail button to open the same app as the Copilot key.
blogs.windows.com -
24.
You can now use Voice Typing (Windows key plus H) when renaming a file in File Explorer.
blogs.windows.com -
25.
You can now sort the permissions entries in the Advanced Security Settings window for a folder in File Explorer by Principal.
blogs.windows.com -
26.
Monitors can now report refresh rates higher than 1000 Hz.
blogs.windows.com -
27.
Removed extraneous error message you might unexpectedly see when running sfc /scannow.
blogs.windows.com
Checked automatically: 8 of 8 checks passed, 27 quoted passages
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake